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Fastener Guide 101 – Different Carriage Bolt Types in The Markets

This bolt guide is made to inform you about various styles available.

Top-notch attributes like size, finish, material, and length of a fastener are crucial, but knowing the style is exponential. With the large variety of head and thread styles, you need to find which one is the ‘right’ kind for your fastening application.


The carriage bolts are typically used for metal fastening onto wooden surfaces. With a mushroom head, the carriage bolt has circular cross-section shank after a small square sectional portion. Using a spanner or wrench tool, the worker can install these bolts on wooden beams along with iron strengthening plates. The square neck prevents turning while tightening the bolt. You can find carriage bolts in different materials like Steel, Stainless Steel, Grade 5, and Grade 8. Similarly, this fastener type comes with finish options like Zinc, Zinc Yellow, Hot Dip Galvanized, and Black Oxide.

Another variety of carriage bolts is the ribbed neck carriage bolt that differs on the neck area with vertical ribs that again prevents turning while tightening or removing the bolt. This kind of bolt is practically used in the furniture industry for fastening two wooden pieces in a permanent position. Finding these ribbed neck carriage bolt in different materials like 18-8 Stainless Steel, Grade 5, and Steel is common. Again, this bolt-type can be finished with Zinc.

As you explore, you can find the structural differences between carriage bolts and DIN 931 bolts that define their scope of applications. Simply put, both of them can’t be used ‘instead’ in vice-versa applications.

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